CN219553248U - Foreign matter inspection device for lower grid plate of reactor core - Google Patents

Abstract

The utility model discloses a foreign matter inspection device for a grid plate under a reactor core, which comprises a shooting mechanism and a long rod mechanism which are detachably connected; the camera shooting mechanism comprises a camera shooting assembly and a driving assembly which is connected with the camera shooting assembly and used for driving the camera shooting assembly to rotate. The foreign matter inspection device for the lower grid plate of the reactor core can extend into the lower grid plate of the reactor core for inspection without hanging out components at the lower part of the reactor core, thereby reducing the maintenance difficulty and greatly shortening the construction period.

Description

Foreign matter inspection device for lower grid plate of reactor core

Technical Field

The utility model relates to the technical field of nuclear power, in particular to a device for checking foreign matters on a grid plate under a reactor core.

Background

Foreign matter in the core of a nuclear power plant can greatly threaten the safe operation of the nuclear power plant, and thus, it is an urgent and complicated task to check whether there is foreign matter in the reactor during major repair. In the past, the lower component is lifted out by the ring crane for distribution inspection, and the work is complicated, the lifting difficulty is high, and the risk is high.

Disclosure of Invention

The utility model aims to provide a foreign matter inspection device for a grid plate under a reactor core.

The technical scheme adopted for solving the technical problems is as follows: constructing a device for checking foreign matters on a grid plate under a reactor core, which comprises a shooting mechanism and a long rod mechanism which are detachably connected;

the camera shooting mechanism comprises a camera shooting assembly and a driving assembly which is connected with the camera shooting assembly and used for driving the camera shooting assembly to rotate.

In some embodiments, the drive assembly comprises a connection sleeve, a bearing seat, a rotating shaft, and a drive motor;

the bearing seat is arranged in one end of the connecting sleeve, the bearing seat is provided with a first through cavity which is axially communicated, the lower end of the bearing seat is provided with a mounting groove, a gear body is arranged in the mounting groove, and the inner cavity of the gear body is provided with teeth arranged along the circumferential direction;

the driving motor is arranged in the connecting sleeve and is connected with the lower end of the bearing seat through a motor seat, a motor shaft of the driving motor stretches into the inner cavity of the gear body, the motor shaft is connected with a driving gear, and the driving gear is meshed with the tooth part;

the rotary shaft comprises a cylindrical part and a shaft part which are axially connected, the outer diameter of the shaft part is smaller than that of the cylindrical part, and the shaft part extends into the first through cavity and is fixedly connected with the gear body.

In some embodiments, the bearing seat is provided with two deep groove ball bearings at intervals along the axial direction, and the two deep groove ball bearings are sleeved on the periphery of the shaft part.

In some embodiments, a positioning plate is arranged at the upper end of the gear body; the lower end of the shaft part is fixedly connected with the positioning plate;

the drive assembly further comprises a detection assembly; the detection assembly comprises a potentiometer, a first gear and a second gear;

the potentiometer is arranged on the mounting plate, the mounting plate is fixed at the lower end of the motor base through the positioning column, the first gear is fixedly connected with the positioning plate, the connecting shaft of the potentiometer is connected with the second gear, and the second gear is meshed with the first gear.

In some embodiments, the rotating shaft has a second through-lumen that is axially therethrough, the second through-lumen in communication with the first through-lumen;

the peripheral wall of the cylindrical part is provided with an inflation inlet communicated with the second through cavity and a sealing cover for sealing the inflation inlet;

and a pressure measuring piece for detecting air pressure is arranged in the cylindrical part.

In some embodiments, the camera mechanism further comprises a connector connected to the barrel; the connector comprises a watertight plug and a plug seat;

the plug seat is connected with the upper end of the cylindrical part, the watertight plug is arranged on the plug seat, and the lower end of the watertight plug is positioned in the cylindrical part.

In some embodiments, the camera assembly includes a housing, a cartridge, and a lens;

the upper end of the shell is fixedly connected with the lower end of the connecting sleeve, the machine core is arranged in the shell, and the lens is arranged at the front end of the machine core.

In some embodiments, a lens cover is sleeved on the periphery of the lens, and the upper end of the lens cover is connected with the lower end of the shell;

and a pressing ring sleeved on the periphery of part of the lens is arranged in the lens cover.

In some embodiments, the image pickup assembly further includes a mirror holder connected to a lower end of the lens housing, and a mirror is disposed in the mirror holder, the mirror being disposed opposite to the lens.

In some embodiments, the device for inspecting foreign matters on the grid plate below the reactor core further comprises an industrial personal computer connected with the camera mechanism.

The implementation of the utility model has the following beneficial effects: the device for checking the foreign matters on the grid plate below the reactor core comprises a shooting mechanism and a long rod mechanism which are detachably connected; the camera shooting mechanism comprises a camera shooting assembly and a driving assembly which is connected with the camera shooting assembly and used for driving the camera shooting assembly to rotate. The foreign matter inspection device for the lower grid plate of the reactor core can extend into the lower grid plate of the reactor core for shooting inspection without hanging out components at the lower part of the reactor core, thereby reducing the maintenance difficulty and greatly shortening the construction period.

Drawings

In order to more clearly illustrate the technical solution of the present utility model, the following description will be given with reference to the accompanying drawings and examples, it being understood that the following drawings only illustrate some examples of the present utility model and should not be construed as limiting the scope, and that other related drawings can be obtained from these drawings by those skilled in the art without the inventive effort. In the accompanying drawings:

FIG. 1 is a schematic view of a lower core grid plate foreign matter inspection apparatus in accordance with some embodiments of the present utility model;

FIG. 2 is a detailed view of an under-core grid plate foreign matter inspection device in some embodiments of the utility model;

FIG. 3 is a partial cross-sectional view of an under-core grid plate foreign matter inspection device in some embodiments of the utility model;

FIG. 4 is an exploded view of a camera assembly in some embodiments of the utility model;

FIG. 5 is an exploded view of a drive assembly in some embodiments of the utility model;

FIG. 6 is a schematic view of the structure of a gear body in some embodiments of the utility model;

FIG. 7 is an exploded view of a connector in some embodiments of the utility model;

FIG. 8 is one of the partial structural schematic illustrations of the drive assembly in some embodiments of the utility model;

FIG. 9 is a schematic second view of a portion of a drive assembly in some embodiments of the utility model;

fig. 10 is a schematic view of an application of the in-core grid plate foreign matter inspection apparatus in some embodiments of the utility model.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model, and do not indicate that the apparatus or element to be referred to must have specific directions, and thus should not be construed as limiting the present utility model.

It should also be noted that unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or one or more intervening elements may also be present. The terms "first," "second," "third," and the like are used merely for convenience in describing the present utility model and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defining "first," "second," "third," etc. may explicitly or implicitly include one or more such features. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present utility model. It will be apparent, however, to one skilled in the art that the present utility model may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present utility model with unnecessary detail.

Referring to fig. 1 to 10, the present utility model shows a lower core grid plate foreign matter inspection apparatus that can inspect the bottom of a pressure vessel and a support assembly of an in-core component through holes of a lower in-core component grid.

The device for checking the foreign matters on the grid plate under the reactor core comprises a shooting mechanism 10 and a long rod mechanism 20 which are detachably connected;

the camera mechanism 10 comprises a camera assembly 11 and a driving assembly 12 connected with the camera assembly 11 and used for driving the camera assembly 11 to rotate, the driving assembly 12 can drive the camera assembly 11 to horizontally rotate to collect graphic information at multiple angles, 360-degree rotation can be carried out to collect the graphic information, the graphic information comprises picture information and/or video information, and the graphic information can be transmitted to a subsequent industrial personal computer or related control device in a wired or wireless mode.

In some embodiments, the camera mechanism 10 is generally cylindrical and may be approximately 50mm in diameter. The long rod mechanism 20 may be a long rod including a plurality of long rods spliced together in the axial direction, and the long rod may be a substantially hollow round rod, which may be connected to the image pickup mechanism 10 by a fastener such as a screw or the like.

In some embodiments, the drive assembly 12 includes a connection sleeve 121, a bearing housing 122, a rotation shaft 123, and a drive motor 124;

the connection sleeve 121 is of generally circular tubular construction and extends axially therethrough so that its interior cavity is available for receiving the associated components.

The bearing pedestal 122 is arranged in one end of the connecting sleeve 121, the bearing pedestal 122 is provided with a first through cavity A which is axially communicated, the lower end of the bearing pedestal 122 is provided with a mounting groove, a gear body 125 is arranged in the mounting groove, and the inner cavity of the gear body 125 is provided with a tooth 1251 which is circumferentially arranged;

the driving motor 124 is installed in the connecting sleeve 121 and is connected with the lower end of the bearing seat 122 through a motor seat 1241, preferably, the motor seat 1241 may be in a cylindrical structure, and is fixed at the lower end of the bearing seat 122 in the axial direction through a fastener such as a screw or a pin, and the motor seat 1241 may limit the gear body 125.

The motor shaft of the driving motor 124 extends into the inner cavity of the gear body 125, and is connected with a driving gear 1242, and the driving gear 1242 is meshed with the tooth 1251;

the rotation shaft 123 includes a cylindrical portion 1231 and a shaft portion 1232 that are axially connected, the outer diameter of the shaft portion 1232 is smaller than the outer diameter of the cylindrical portion 1231, and the shaft portion 1232 extends into the first through cavity a and is fixedly connected to the gear body 125. When the driving motor 124 drives the driving gear 1242 to rotate, the connecting sleeve 121 and the rotating shaft 123 can rotate relatively, and the connecting sleeve 121 is connected with the subsequent camera assembly 11, so that the camera assembly 11 can rotate horizontally.

Preferably, the bearing seat 122 is provided with two deep groove ball bearings 1221 at intervals along the axial direction, the two deep groove ball bearings 1221 are provided at intervals along the axial direction, and the two deep groove ball bearings 1221 are sleeved on the outer periphery of the shaft part 1232.

Preferably, a dynamic seal 1222 is also provided in the first through cavity a of the bearing housing 122, which is engaged with the outer periphery of the shaft portion 1232.

Preferably, the upper end of the gear body 125 is provided with a positioning plate 1252; the lower end of the shaft portion 1232 is fixedly connected with the positioning plate 1252;

the drive assembly 12 also includes a detection assembly 126; the detection assembly 126 includes a potentiometer 1261, a first gear 1262, and a second gear 1263;

the potentiometer 1261 is installed on the mounting plate 1264, and the mounting plate 1264 passes through the lower extreme of the fixed motor cabinet 1241 of reference column 1265, and first gear 1262 and the fixed connection of locating plate 1252 can be through the cooperation of fastening screw etc. fixed, and the connecting axle of potentiometer 1261 is connected with second gear 1263, and second gear 1263 meshes with first gear 1262 for this potentiometer 1261 can detect drive assembly 12's rotational speed and rotation angle. In some embodiments, the angle sensor may be configured to detect.

Preferably, the rotating shaft 123 has a second through cavity B that is axially through, the second through cavity B is communicated with the first through cavity a, the peripheral wall of the cylindrical portion 1231 is provided with an inflation inlet that is communicated with the second through cavity B, and a sealing cover 127 that is used for sealing the inflation inlet, and a pressure measuring piece 128 that is used for detecting air pressure is arranged in the cylindrical portion 1231, and is used for detecting air pressure inside the camera mechanism 10, so as to avoid damage to components due to water seepage and the like. Preferably, the pressure measuring part 128 may be a pressure plate or a pressure sensor, and the data detected by the pressure measuring part 128 may be sent to the industrial personal computer 50 in a wired or wireless manner, and once the pressure is too low, the industrial personal computer 50 may perform an audible and visual alarm, so as to effectively avoid damage caused by seal failure.

Preferably, the camera mechanism 10 further includes a connector 13 connected to the cylindrical portion 1231, and the connector 13 is connectable to an external cable, so that the cable can be divided into two parts above water and below water, and the purpose of the cable is to reduce pollution sources, and to facilitate clean decontamination in the field, because the water part may not be decontaminated.

The connector 13 may be connected to the driving motor 124 and the camera assembly 11 through cables, and the first through cavity a and the second through cavity B may be used for routing wires; the connector 13 includes a watertight plug 131 and a plug housing 132, the plug housing 132 is connected to an upper end of the cylindrical portion 1231, the watertight plug 131 is mounted on the plug housing 132, and a lower end of the watertight plug 131 is located in the cylindrical portion 1231.

Preferably, the plug seat 132 may have a substantially ring structure, the inner cavity of the plug seat has a stepped portion 1321, the outer periphery of the watertight plug 131 is provided with a protrusion 1311, the protrusion 1311 may abut against the upper side of the stepped portion 1321, so as to improve the sealing performance, and the portion of the watertight plug 131 extending into the cylindrical portion 1231 may be locked and fixed by the locking nut 133.

Preferably, the camera assembly 11 includes a housing 111, a movement 112, and a lens 113;

the casing 111 may be a circular tube structure, the upper end of the casing 111 and the lower end of the connecting sleeve 121 may be fixedly connected, for example, by a fastener such as a screw, etc., and the outer periphery of the connecting portion between the casing 111 and the connecting sleeve 121 may be sleeved with a protective sleeve 1211, the movement 112 is disposed in the casing 111, and the lens 113 is disposed at the front end of the movement 112. Preferably, the lens 113 is a compound lens. Preferably, the interchangeable focal length of the lens 113 is three of 4mm,8mm and 12mm, and a short focal length lens is used for the observation of a closer object or the inner wall of a pipeline; and when the medium-distance and long-distance target observation is carried out, a long-focus lens is adopted.

Preferably, a lens cover 114 is sleeved on the periphery of the lens 113, the lens cover 114 has a circular tube structure, and the upper end of the lens cover 114 is connected with the lower end of the casing 111;

a clamp 115 is provided in the lens cover 114 to be fitted around a part of the outer periphery of the lens 113.

In some embodiments, the image capturing assembly 11 further includes a mirror holder 116 connected to a lower end of the lens housing 114, and a mirror 117 is disposed in the mirror holder 116, and the mirror 117 is disposed opposite the lens 113. Preferably, the interior cavity of the reflector holder 116 may also be provided with a press block 118. The reflector mechanism well meets the observation requirements of narrow spaces, especially the inner walls of pipelines.

Preferably, all components of the camera assembly 11 are made of a radiation-resistant material, such as a lead-containing material, and the cartridge may be a high radiation-resistant image sensor. The case 111, the lens cover 114, etc. may be made of a shielding material.

Preferably, the joints between the camera assembly 11, the driving assembly 12 and the connector 13 can be added with a sealing waterproof structure according to the requirement, such as a waterproof sealing ring.

Preferably, the imaging assembly 11 is configured to withstand a cumulative radiation dose rate of 1X 104Gy/h, and a cumulative dose of 1X 106Gy.

In some embodiments, the upper end of the long bar mechanism 20 is fixedly mounted to a hanger 30, and the hanger 30 is fixed to a passenger bridge railing or a refueling truck railing. The long rod mechanism 20 is of a multi-section detachable structure, and the long rod mechanism 20 adopts a carbon fiber suspender, and is characterized by high strength and high rigidity, light and handy texture and convenient field installation. When the monitoring device is used, the imaging mechanism 10 can be adjusted to a proper height and position through the lifting adjusting mechanism on the hanging frame 30, and then the accurate shooting setting of the monitoring target is carried out through controlling the angle of the driving component 12 and the focal length of the imaging component 11.

In some embodiments, the light condition of the bottom of the pressure vessel and the internal components of the pile is poor, the equipment needs to ensure the imaging definition in the low-light condition, and an auxiliary illumination light source 40 can be provided to increase the field illumination and ensure the imaging definition. The auxiliary illumination light source 40 can be composed of a railing, a hanging rack, a long rod and auxiliary illumination lamps, wherein one auxiliary illumination lamp is arranged in the radial direction in the axial direction, and a diffuse reflection structure is adopted, so that enough illumination is ensured, and the auxiliary illumination light source is safe and reliable. The auxiliary illuminating lamp penetrates into a position needing to be illuminated through the auxiliary rod tool.

Of course, the camera mechanism 10 may be configured with an illumination assembly, such as an LED illumination assembly, an infrared light source, or the like.

In some embodiments, the under-core grid plate foreign matter inspection apparatus further includes an industrial personal computer 50 connected to the camera mechanism 10.

It can be understood that the foreign matter inspection device for the lower grid plate of the reactor core can extend into the lower grid plate of the reactor core for shooting inspection without hanging out lower components of the reactor core, thereby reducing the maintenance difficulty and greatly shortening the construction period.

It is to be understood that the above examples only represent preferred embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the utility model; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (10)

1. The device for checking the foreign matter on the grid plate under the reactor core is characterized by comprising an imaging mechanism (10) and a long rod mechanism (20) which are detachably connected;

the camera shooting mechanism (10) comprises a camera shooting assembly (11) and a driving assembly (12) connected with the camera shooting assembly (11) and used for driving the camera shooting assembly (11) to rotate.

2. The under-core grid plate foreign matter inspection apparatus according to claim 1, wherein the driving assembly (12) includes a connection sleeve (121), a bearing housing (122), a rotation shaft (123), and a driving motor (124);

the bearing seat (122) is arranged in one end of the connecting sleeve (121), the bearing seat (122) is provided with a first through cavity (A) which is axially communicated, the lower end of the bearing seat (122) is provided with a mounting groove, a gear body (125) is arranged in the mounting groove, and the inner cavity of the gear body (125) is provided with a tooth part (1251) which is circumferentially arranged;

the driving motor (124) is installed in the connecting sleeve (121) and is connected with the lower end of the bearing seat (122) through a motor seat (1241), a motor shaft of the driving motor (124) stretches into an inner cavity of the gear body (125), the motor shaft is connected with a driving gear (1242), and the driving gear (1242) is meshed with the tooth part (1251);

the rotary shaft (123) comprises a cylindrical part (1231) and a shaft part (1232) which are axially connected, the outer diameter of the shaft part (1232) is smaller than that of the cylindrical part (1231), and the shaft part (1232) stretches into the first through cavity (A) and is fixedly connected with the gear body (125).

3. The device for inspecting foreign matter on a grid plate under a reactor core according to claim 2, wherein the bearing block (122) is provided with two deep groove ball bearings (1221) at intervals along the axial direction, and the two deep groove ball bearings (1221) are both sleeved on the outer periphery of the shaft part (1232).

4. The under-core grid plate foreign matter inspection apparatus according to claim 3, characterized in that a positioning plate (1252) is provided at an upper end of the gear body (125); the lower end of the shaft part (1232) is fixedly connected with the positioning plate (1252);

the drive assembly (12) further includes a detection assembly (126); the detection assembly (126) includes a potentiometer (1261), a first gear (1262), and a second gear (1263);

the potentiometer (1261) is installed on the mounting plate (1264), the mounting plate (1264) is fixed through reference column (1265) the lower extreme of motor cabinet (1241), first gear (1262) with fixed connection of locating plate (1252), the connecting axle of potentiometer (1261) with second gear (1263) is connected, second gear (1263) with first gear (1262) meshing.

5. The under-core grid plate foreign matter inspection device according to claim 2, characterized in that the rotating shaft (123) has a second through cavity (B) that is axially penetrated, the second through cavity (B) being in communication with the first through cavity (a);

the peripheral wall of the cylindrical part (1231) is provided with an inflation inlet communicated with the second through cavity (B) and a sealing cover (127) for sealing the inflation inlet;

a pressure measuring member (128) for detecting air pressure is provided in the cylindrical portion (1231).

6. The under-core grid plate foreign matter inspection device according to claim 5, characterized in that the image pickup mechanism (10) further includes a connector (13) connected to the cylindrical portion (1231); the connector (13) comprises a watertight plug (131) and a plug seat (132);

the plug seat (132) is connected with the upper end of the cylindrical part (1231), the watertight plug (131) is installed on the plug seat (132), and the lower end of the watertight plug (131) is positioned in the cylindrical part (1231).

7. The in-core lower grid plate foreign matter inspection device according to any one of claims 2 to 6, characterized in that the image pickup assembly (11) includes a chassis (111), a movement (112), and a lens (113);

the upper end of the shell (111) is fixedly connected with the lower end of the connecting sleeve (121), the movement (112) is arranged in the shell (111), and the lens (113) is arranged at the front end of the movement (112).

8. The in-core lower grid plate foreign matter inspection device according to claim 7, characterized in that a lens cover (114) is fitted around the periphery of the lens (113), and the upper end of the lens cover (114) is connected to the lower end of the casing (111);

a pressing ring (115) sleeved on the outer periphery of part of the lens (113) is arranged in the lens cover (114).

9. The under-core grid plate foreign matter inspection device according to claim 8, characterized in that the image pickup assembly (11) further includes a mirror frame (116) connected to a lower end of the lens cover (114), a mirror (117) is provided in the mirror frame (116), and the mirror (117) is disposed opposite to the lens (113).

10. The under-core grid plate foreign matter inspection device according to claim 9, further comprising an industrial personal computer connected to the imaging mechanism (10).